aecidium
noun
ae·cid·i·um
ē-ˈsi-dē-əm
1
plural aecidia
ē-ˈsi-dē-ə
: aecium especially : a cup-shaped or spheroidal aecium with a peridial layer
2
capitalized : a form genus of rust fungi having only an aecial stage with toothed cup-shaped peridia
Word History
Etymology
borrowed from New Latin, irregularly for *oecidium, borrowed from Greek oikídion, diminutive of oîkos "house, abode, room"
First Known Use
1751, in the meaning defined at sense 2